Kev ua tau zoo ntawm PCB yuav raug cuam tshuam los ntawm ntau yam sab nraud lossis ib puag ncig, xws li ya raws, huab cua kub, tshuaj tsuag ntsev thiab tshuaj lom neeg. Cov txheej tiv thaiv yog ib zaj duab xis polymer coated rau saum npoo ntawm PCB los tiv thaiv PCB thiab nws cov khoom los ntawm corrosion thiab ib puag ncig muaj kuab paug.

Los ntawm kev tiv thaiv kev cuam tshuam ntawm cov kab mob thiab ib puag ncig, cov txheej txheem tiv thaiv tuaj yeem tiv thaiv corrosion ntawm conductors, solder pob qij txha thiab kab. Tsis tas li ntawd, nws tseem tuaj yeem ua lub luag haujlwm hauv kev rwb thaiv tsev, yog li txo qhov cuam tshuam ntawm thermal thiab mechanical stress ntawm lub Cheebtsam.

Cov txheej tiv thaiv yog ib feem tseem ceeb ntawm cov ntawv luam tawm Circuit Board. Lub thickness yog feem ntau ntawm 3-8 mils (0.075-0.2 hli). Nws yog dav siv hauv aerospace, automotive, tub rog, marine, teeb pom kev zoo, khoom siv hluav taws xob thiab kev lag luam.

Hom PCB tiv thaiv txheej

Raws li cov tshuaj muaj pes tsawg leeg, cov tshuaj tiv thaiv tuaj yeem muab faib ua tsib hom, xws li acrylic, epoxy, polyurethane, silicone thiab p-xylene. Kev xaiv ntawm cov txheej txheem tshwj xeeb yog ua raws li PCB daim ntawv thov thiab cov khoom siv hluav taws xob. Tsuas yog los ntawm kev xaiv cov khoom tsim nyog tuaj yeem tiv thaiv PCB zoo.

Acrylic tiv thaiv txheej:

Acrylic resin (AR) yog preformed acrylic polymer uas yog yaj nyob rau hauv ib qho hnyav thiab siv los coated nto ntawm PCB. Acrylic tiv thaiv txheej tuaj yeem txhuam los ntawm tes, txau lossis dipped rau hauv acrylic resin txheej. Qhov no yog cov txheej txheem tiv thaiv feem ntau siv rau PCBs.

Polyurethane tiv thaiv txheej:

Polyurethane (UR) txheej muaj kev tiv thaiv zoo heev los ntawm cov tshuaj lom neeg, noo noo thiab puas. Polyurethane (UR) txheej tiv thaiv yog ib qho yooj yim mus thov tab sis nyuaj rau tshem tawm. Nws tsis pom zoo kom kho nws ncaj qha los ntawm tshav kub los yog cov hlau soldering, vim tias nws yuav tso tawm cov pa phem isocyanate.

Epoxy resin (ER hom):

Epoxy resin muaj cov khoom zoo khaws cia hauv qhov chaw hnyav. Nws yog ib qho yooj yim mus use, tab sis yuav puas lub Circuit Court thaum nws yog disassembled. Epoxy resin feem ntau yog ob lub ntsiab lus thermosetting sib tov. Ib feem sib txuas yog kho los ntawm tshav kub lossis hluav taws xob ultraviolet.

Silicone (SR hom):

Silicone (SR hom) txheej tiv thaiv yog siv nyob rau hauv qhov kub thiab txias. Cov txheej txheej no yog ib qho yooj yim rau kev thov thiab muaj toxicity tsawg, thiab muaj kev tiv thaiv hnav thiab noo-pov thawj. Silicone coatings yog ib qho kev sib xyaw ua ke.

Paraxylene:

Cov txheej txheem paraxylene yog siv rau PCB siv cov txheej txheem tshuaj vapor deposition. Paraxylene dhau los ua roj thaum rhuab, thiab tom qab cov txheej txheem txias, nws tau muab tso rau hauv lub chamber uas nws polymerizes thiab dhau los ua ib zaj duab xis nyias. Tom qab ntawd cov zaj duab xis yog coated rau saum npoo ntawm PCB.

PCB tiv thaiv txheej xaiv phau ntawv qhia

Hom txheej txheej yog nyob ntawm qhov tuab ntawm cov txheej uas yuav tsum tau ua, thaj chaw yuav tsum tau npog, thiab qib ntawm adhesion ntawm txheej rau lub rooj tsavxwm thiab nws cov khoom.

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